Kings Henry I and Charles II were the
only Kings of England to beget really large broods of illegitimate offspring.
Charles, credited with 8 sons and 6 daughters, is clearly outdone by Henry
with a known illegitimate offspring list consisting of 9 sons and between
12 and 15 daughters. There may be more, too. The name of the
mother is known with varying degrees of certainly for 12 of the children.

Perhaps King Henry had so many girlfriends
and children that he forgot who belonged to whom.

And there may have been more "associates" along with additional children
. . .

Robert de Caen, Earl of GloucesterBorn circa 1090 at Caen, FranceDied on October 31, 1147 at Bristol

Robert married to Mabel (Maud) Fitzhamon, daughter and
heiress of Robert FitzHamon, Lord of Glamorgan and his wife Sibyl who was
a daughter of Roger de Montgomery, 1st Earl of Shrewsbury who accompanied
William the Conqueror in 1066 and was present at the Battle of Hastings.